Process of making phosphorus pentoxid and titanium compounds.



s. PEACOOK.

PROGESS OF MAKING PHOSPHOBUS PENTOXID AND TITANIUM APPLIGATIOH Hum AUG. 2, 1909.

COMPOUNDS.

995,897. Patented June 20,1911.

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' TE srarns 'rrnr one c SAMUEL PEACOGK, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN CYANAMID COMPANY, OF NEW YORK, N. Y., A CORPORATION OF MAINE.

PROCESS OF. MAKING PHOSPHORUS PENTOXID AND TITANIUM COMPOUNDS.

Specification of Letters Patent.

Patented June20, 1911.

Application filed August 2, 1909. Serial No. 510,931.-

To all whom it may concern:

Be it known that I, SAMUEL PEACOCK, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented acertain new and useful Process for Making Phosphorus Pentoxid and Titanium Compounds; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to a process of making pentoxid of phosphorus, (P 0 and titanium compounds from lime phosphates 'and'titanic oxid .(TiO in a simple and resents any suitable supports, 2 stationary end closures provided With an inlet 3 for the fuel and an exit 4 for the gases.

5 represents a rotating barrel part, 6

means for rotating the same, 7 a hopper for receiving the rock mixture, 8 a screw conveyer for the same, 9 a delivery spout leading into the furnace, 10a suitable delivery passage-for the roasted products consisting largely of calcium compounds of iron, aluminum, silica and titanium, and 12 a suitable receptacle for receiving the same.

The following analysis of phosphate of lime suitable fonthis purpose, will serve as a basis of computation Pentoxid of phosphorus.

ime

ater, etc

l oxid of titanium in accordance to the following react1ons:-

-It is to be understood, however, that one or more of the various basic lime compounds of titanium, of silica, pf alumina, or of ferric oxid may be ;produced either Wholly or in part in place of the various lime compounds detailed in the above reactions. That is to say, instead of monocalcium titanate, CaO.TiO,, dicalcium titanate, 2CaO.TiO or tri-calcium titanate 3CaO.TiO,, may be produced; Such basic compounds would be formed should there be present an excess of Ca(), due to an imperfect mixing of the chargea contingency not possible to guard against at all times. In like manner, the following basic silicates may be formed :,Instead of the mono-calcium silicateC-aO.SiO .we may have the di-calcium silicate2CaO.SiO, or the tri-calcium silicates8CaO.SiO The corresponding aluminum salts are Instead of the monocalcium aluminate CaO.Al,O,,-we may have the dicalcium aluminate2( a().Al or the tricalcium aluminate3CaO.Al O The corresponding ferric iron salts that may be formed are :Instead of the mono-calcium ferrite- (3aO.Fe O -we may have the d'icalcium ferrite2CaO.Fe,(),-or the tricalcium ferrite3CaO.Fe ,O,. The di and tri calcium silicates, aluminates and ferrites above are basic in character, as is well known. In place of a pure oxid of titanium, a crude mineral or precipitates may be used; the accompanying iron oxids, silica, alumina, etc, present, being computed to, and the proportioning of the quantity of lime phosphate in the mixture adjusted for, the series of reactions accredited to the similar impurities in the crude phosphate of lime.

'The mixture of phosphate of lime and oxid of titanium are proportioned in compliance with the requirements of the above general reaction, when the whole is finely pulverized, thoroughly mixed together and passed through and heated to about 1500, degrees C. in 'any suitable furnace preferably one of the'type shown herewith. During thistreatment the lime combinations set forth above take place, and the pentoxid of phosphorus set free is expelled by volatilization, when it is either absorbed in Water or condensed, or it may be used as an acid upon fresh quantities of phosphate of lime, as occasion may justify or require.

On the basis of furnacing 2000 pounds of phosphate of lime of the analysis given above, the proportioning of materials would be substantially as follows :-One short ton of such phosphate contains Lime 820 lbs.

Aiumina....... 100 which requires lbs. of lime.

Ferric oxid..... 50 21 Silica 280 260 Total lime required 336 lbs.

As one ton of the phosphate contains 820 pounds of lime, and 336 pounds are required to satisfy the silica and other impurities contained .in the same, there remains 484 pounds of lime to be combined with the oxid of titanium. In accordance with the combining equivalents of lime and oxid titanium, one pound of the former requires 1.43 pounds of the latter; and, therefore, the 484 pounds of surplus lime require 692 pounds of oxid of titanium, and the furnace mixture should consist of Phosphate of lime 2,000 pounds. Oxid of t1tanium....' 692 The usefulness of this invention rests upon :-1. The formation of lime salts of titanium oxid, which have the property of being decomposed by hot alkaline solutions, and,'therefore,' valuable forms of the pure oxid may be readily and cheaply produced.

2. The comparatively inexpensive produchave disclosed a process for making pentoxid of phosphorus, calcium silicates'and calcium aluminates; and in' my co-pending application #510,932, filed August 2, 1909, I have disclosed a process of'm'aking phosphorus.

pentoxid and iron compounds of calcium. IVhat I claim is 1. The process of producing the pentoxid of. phosphorus from oxid of titanium and lime phosphate which consists in mixing said oxid of titanium and phosphate in such proportions that chemically equivalent quantit-ies of calcium oxid will be supplied to the oxid of titanium present in the mixture to form a titanium-lime compound; and in heating said mixture to a temperature suiticient to form said compound and to free said pentoxid of phosphorus from the lime phosphate, substantially as described.

2. Theprocess of producing the pentoxid of phosphorus from oxid of titanium and phosphate rock which consists in mixing said oxid of titanium. and phosphate rock in such proportions that sufiicient calcium oxid will be present in the mixture to chemically react with substantially all the oxid of titanium, alumina, ferric oxid, and silica that may also be present; and in heatingv the mixture to a temperature sufficient to bring about, such reactions and to free said pentoxid from-said phosphate; substantially as described.

3. The process of producing P O 'and CaTiO, from oxid of titanium and phosphate rock in a single operation which consists in mixing 2000 pounds of said rock with-substantially 692 pounds of oxid of titanium, in heating the said mixture to substantially 1500 degrees C.; in collecting the P 0 driven OE, and in collecting theCaTiO formed;

substantially as described.

'In testimony whereof, I atiixmy signature, in presence of two witnesses.

SAMUEL PEACOCK. 

